Isaac harter



July 12 1927.

I. HARTER 1535310 STEAM POWER SYSTEI Filed Jan. 10. 1925 l F I; V I rw F & 5 r Q T v 1 1 INVENTOR r N k I j ya Mt Patented July 12, 1927.

UNITED STATES PATENT OFFICE.

ISAAC HARTER, F DONGAN HILLS, NEW YORK, ASSIG-NOR TO THE BABCOGK & WIL- COX COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

STEAMPOWER SYSTEM.

Application filed January 10, 1925.

My present invention relates to steam power systems, particularly those in which which supply steam directly to the prime mover.

My invention will be best understood from the following description and the annexed drawing, in which 1 is a more or less diagrammatic arrangement of the parts con stituting one embodiment of my invention, with some of the parts broken away; Fig. 2 shows the preferred water tube arrangement in the auxiliary steam generator, and

exhaust steam entering the heater 15.

Fig. 3 is a section on the line 3-3 of Fig. 1.

Like reference characters indicate like parts in the several views.

In the arrangement shown in the drawings, one or more steam generators supply steam to a steam main 11 leading through the pipe 12 to the high pressure stage of a steam turbine 13. In the illustrative form, some or all of the exhaust steam from the high pressure stage is diverted from the next stage through the pipe 1 1 to a heater 15 and from thence through the pipe-16 back to the next stage of the turbins 13.

The heater 15 is supplied with high pressure steam which may be either saturated or superheated but which, in any event, will have a higher temperature than that 01% thle i. no 1 heating steam is supplied through the pipe 17 from anauxiliary generator 18, the condensate from the heater 15 returning to the generator 18 through the pipe 19.

Preferably the steam generator 18 is of the series type; that is, the water heating surfaces are made of a series of tubes arranged so that the water entering through the pipe 19 will pass through the boiler tubes to be gradually converted into steam passing out through the pipe 17. In Fig. 2, such an arrangement is shown. a. bank of headers 20 being connected by U-tubes 20. A. pump 21 may be provided to force the water through the tubes 20 and a make-up water supply pump 22 may also be pro vided.

Preferably the auxiliary generatorlti will have a relatively small amount of Benin he understood iii Serial No. 1,514.

surface in order to reduce the. cost of construction. This, however, would produce an inefficient steam generator because of the resulting high flue gas temperatures. Moreover, because of variations in the requirements of heating steam in the heater 15, due to variations in the operation of the turbine 18, the generator 18 will be operated under variable conditions. Consequently the flue gases from the generator 18 will contain a large amount of heat and, therefore, the operation of this auxiliary will be correspondingly inefficient unless provision is made to obviate the difliculty.

In order to avoid this waste, I may connect the flue gas outlet of the generator 18 with the gas passages in one or more of the main generators 10, an illustrative arrangement being shown in Figs. 1 and 3. In the form illustrated, the flue gases from the generator 18 pass through a duct 23 into a vertical flue 24% which is connected with the lower part of the third pass of a horizontal crossbai'tled water tube boiler which is the form of generator illustrated. As is well understood, the horizontal tubcs 25 of such a boiler are provided with transverse baffles 26 and 27 to give the gases up and down passes across the tubes from the furnace gas inlet 28 to the flue gas exit 29, the boiler 10 being fired in any suitable manner, as by a chain grate stoker 30. A damper 31 may be provided in the flue 24 to regulate the draft through the generator 18.

Vith. the arrangement described, it will be obvious that the furnace under the auxiliary generator 18 may be operated in a more or less fixed manner without loss of efficiency, because if the heating steam requirements of the heater 15 decrease, and the flue gas temperatures of the auxiliary 18 correspondingly increase, nevertheless such heat will be delivered to the heating surfaces of the boiler 10 and will thus be transferred to the power system.

It will be understood that the arrangement which I have illustrated may be varied within wide limits. For instance, the flue gases from the auxiliary 18 may be delivered to the heating surfaces of the boiler 10 at any desired point between the furnace gas inlet of the boiler 10 and its gas outlet.

While preferably 1 use a "series type of 1 A ooiler for the aux hary generator 18, it will at other type of generator may be used. It will also be understood that the main generators 10 may be of any desired type of steam boiler.

I claim:

1. In a steam power system, a multi-stage prime mover, a main steam generator to sup ply steam to said prime mover, an exhaust steam heater through which exhaust steam passes between stages in said prime mover, an auxiliary steam gen-erator, connections between said auxiliarygenerator and said heater to deliver steam to said heater at a temperature higher than that of the exhaust steam passing therethrough, and a duct to lead the flue gases from said auxiliary generator to the steam generating surfaces of said main steam generator.

2. In a steam power system, a multi-stage prime mover, a main steam generator to sup- .ply steam to said prime mover, an exhaust steam heater through which exhaust steam passes between stages in said prime mover, an auxiliary steam generator, connections between said auxiliary generator and said heater to deliver steam to said heater at a temperature higher than that of the exhaust steam passing therethrough, and a duct to lead the flue gases from said auxiliary generator to the steam generating surfaces of said main steam generator at a point removed from the gas inlet from the furnace of said main generator to such gen erating surfaces. I

3. In a steam power system, a multistage prime mover, a main Water tube steam generator to supply steam to said prime mover, saidmain generator having bafiies to provide a plurality of transverse passes for the therethrough, and a duct to lead the flue gases from said auxiliary generator to a pass 1n said mam generator at a point removed from the gas inlet from the furnace of said main generator to the heating surface of said main generator.

4. In a steam power system, a i'm ilti-stage prime mover, a main water tube steam generator to supply steam to said prime mover, an exhaust steam heater through which exhaust steam passes between stages in said prime mover, an auxiliary steam generator having its steam generating surface proportioned and arranged to give a higher flue gas temperature than the flue gas temperature of said main steam generator, connections between said auxiliary generator and said heater to deliver steam to said heater at a temperature higher, than that of the exhaust steam passing therethrough, and a duct to lead the flue gases from said auxiliary generator to the steam generating surfaces of said main generator at a point re moved from the gas inlet from the furnace of said main generator to said generating surfaces.

ISAAC HARTER. 

